I have had this play before as the PU. I ruled a catch by F6 on a sinking line drive. In my play there were no other runners on. The third base coach (who had the best angle) immediately started in on me...she didn't catch that, go check with your partner, etc....

I went to my partner who confirmed that the ball was caught on the short hop. However, everybody stopped when I called the out.

Call stands..I take some grief from the offensive coach...we play ball.

Now on a play like that, I first try to get some sort of angle by moving out from behind the plate sideways, then glance to my partner for any type of help, if I don't get that, I may use the reaction of the fielder to help...if she comes up throwing to first, she didn't catch it. Not always foolproof, but you work with what you've got.